EP1680180A1 - Implantable medical lead and method of manufacture - Google Patents
Implantable medical lead and method of manufactureInfo
- Publication number
- EP1680180A1 EP1680180A1 EP04794173A EP04794173A EP1680180A1 EP 1680180 A1 EP1680180 A1 EP 1680180A1 EP 04794173 A EP04794173 A EP 04794173A EP 04794173 A EP04794173 A EP 04794173A EP 1680180 A1 EP1680180 A1 EP 1680180A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strut
- twist
- conductor
- twist ring
- ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/02—Details
- A61N1/04—Electrodes
- A61N1/05—Electrodes for implantation or insertion into the body, e.g. heart electrode
- A61N1/056—Transvascular endocardial electrode systems
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/02—Details
- A61N1/04—Electrodes
- A61N1/05—Electrodes for implantation or insertion into the body, e.g. heart electrode
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/02—Details
- A61N1/04—Electrodes
- A61N1/05—Electrodes for implantation or insertion into the body, e.g. heart electrode
- A61N1/0551—Spinal or peripheral nerve electrodes
Definitions
- This invention relates to a medical device and more particularly to implantable neurological electrical stimulators and implantable electrical stimulation leads.
- the medical device industry produces a wide variety of electronic and mechanical devices for treating patient medical conditions such as pacemakers, defibrillators, neuro-stimulators and therapeutic substance delivery pumps.
- Medical devices can be configured to be surgically implanted or comiected externally to the patient receiving treatment.
- Clinicians use medical devices alone or in combination with therapeutic substance therapies and surgery to treat patient medical conditions. For some medical conditions, medical devices provide the best and sometimes the only therapy to restore an individual to a more healthful condition and a fuller life.
- the neurostimulation system typically includes a neurostimulator, a stimulation lead, and an extension such as shown in Medtronic, Inc. brochure "Implantable Neurostimulation System” (1998). More specifically, the neurostimulator system can be an Itrel IITM Model 7424 or an Itrel 3TM Model 7425 available from Medtronic, Inc. in Minneapolis, Minn, that can be used to treat conditions such as pain, movement disorders and pelvic floor disorders.
- the neurostimulator is typically connected to a stimulation lead that has one or more electrodes to deliver electrical stimulation to a specific location in the patient's body.
- an exemplary embodiment of a lead body that has variable stiffness and provides both the flex life of the current, low impedance, BSW family of leads as well as a coiled conductor configuration that minimizes the loading of the electrical connections at either end of that configuration.
- a first exempla y embodiment of the invention is a method of manufacturing an implantable electrical lead body.
- the method generally comprises: (a) assembling, along an outer surface of inner elongate structure defining an longitudinal axis, at least one elongate conductor and at least one twist ring holding a first portion of the elongate conductor; (b) fixing a second portion of the elongate conductor to the outer surface of the inner elongate structure, the second portion of the elongate conductor being spaced along the length of the elongate conductor; and (c) rotating the twist ring relative to the longitudinal axis of the inner elongate structure to coil the at least one elongate conductor.
- the step of assembling, along an outer surface of inner elongate structure defining an longitudinal axis, at least one elongate conductor and at least one twist ring holding a first portion of the elongate conductor may be performed before, during or after the step of fixing a second portion of the elongate conductor to the outer surface of the inner elongate structure, the second portion of the elongate conductor being spaced along the length of the elongate conductor.
- the method generally comprises: (a) providing an elongate strut, first and second twist rings, and at least one conductor, the first and second twist rings having at least one opening or groove for receiving and holding at least one conductor; (b) fixing the first twist ring to the strut; (c) threading the at least one conductor wire through the opening or groove in the first twist ring; (d) placing a second twist ring on the strut wherein upon conclusion of steps (b) and (d) the first and second twist rings are spaced apart along the strut; (e) threading the at least one conductor through the opening or groove in the second twist ring, wherein steps (b) through (e) may be performed in any order and upon conclusion of steps (b) through (e) a segment of the at least one conductor is defined between the first and second twist rings; (f) rotating the second twist ring relative to the longitudinal axis of the strut to coil the segment of at least one elongate conductor between the first
- an outer jacket is placed over the strut before only one of steps (b) of fixing the first twist ring to the strut, and (d) of placing the second twist ring to the strut.
- the outer jacket may be placed over the strut is performed after step (b) of fixing the first twist ring to the strut and before step (d) of placing the second twist ring to the strut.
- the outer jacket may be placed over the strut before or after step (c) of threading the at least one conductor wire through the opening or groove in the first twist ring.
- the first and second twist rings may be fixed to the strut by bonding, adhesive, mechanical fixation or otherwise.
- the second exemplary method further includes: (h) placing a third twist ring on the strut wherein upon conclusion of steps (b), (c) and (h) the first, second and third twist rings are spaced apart along the strut, the third twist ring having an opening or groove; (i) threading the at least one conductor through the opening or groove in the third twist ring, wherein steps (b) through (e) and (h) through (i) may be performed in any order and upon conclusion thereof a second segment of the at least one conductor is defined between the third twist ring and one of the first and second twist rings; (j) rotating the third twist ring relative to the longitudinal axis of the strut to coil the second segment of the at least one elongate conductor at a second pitch or second direction of wind different than the first pitch or first direction of wind; and (g) fixing the third twist ring to the strut.
- This preferred exemplary embodiment may also optionally include: (k) before only one of steps (b) of fixing the first twist ring to the strut, and (d) of placing the second twist ring to the strut, placing a first outer jacket portion over the strut such that upon conclusion of steps (b) and (d) the first outer jacket portion is arranged between the first and second twist rings; and (1) before the step (h) of placing the third twist ring, placing a second outer jacket portion over the strut such that upon conclusion of steps (b), (d) and (h) the second outer jacket portion is arranged between the third twist ring and one of the first and second twist rings.
- a second exemplary embodiment of the invention is an implantable electrical lead.
- the implantable electrical lead generally comprises proximal and distal end portions, and a lead body extending between the proximal and distal end portions.
- At least one electrical contact in the proximal end portion is adapted to make electrical contact with a connector of a lead extension or pulse generator.
- At least one electrode in the distal end portion is adapted to interact with tissue.
- At least one elongate conductor extends through the lead body between the proximal and distal portions in electrical communication with the contact and electrode.
- the conductor includes along its length at least a first portion, a second portion spaced along the length of conductor from the first portion, and a first segment defined between the first and second portion.
- the lead body includes an inner elongate structure defining an longitudinal axis, and first and second twist rings mounted on the inner elongate structure.
- the first and second twist rings hold the first and second portions, respectively, of the elongate conductor.
- one of the first and second twist rings has been rotated about the inner elongate structure relative to the other of the first and second twist rings to coil the first segment of the elongate conductor, and both twist rings have been bonded to the inner elongate structure.
- An outer jacket covers the inner elongate structure and first segment of the elongate conductor between the first and second twist rings.
- FIG. 1 shows a general environmental view for a neurostimulation system embodiment.
- FIG. 2 shows a neurostimulation system embodiment.
- FIG. 3 shows a neurostimulation lead embodiment.
- FIG. 4 and 5 illustrate a preferred embodiment of the method, in which the originally straight conductors are coiled (note that figure 5 also illustrates use of strut sections having different stiffnesses).
- FIG. 6 illustrates an exemplary embodiment of a twist ring having wire grooves.
- FIG. 7 illustrates an exemplary embodiment of the method adapted for imparting a different pitch or direction of wind to adjacent wire segments.
- FIGS. 8-10 illustrate exemplary preferred embodiments of the method of the invention, and although provide in flow chart format are not intended to limit the method to any particular order of the illustrated steps.
- FIG. 1 shows a general environmental view 10 for an implantable neurostimulation system embodiment.
- Neurostimulation systems are used to treat conditions such as pain, movement disorders, pelvic floor disorders, gastroparesis, and a wide variety of other medical conditions.
- the neurostimulation system 20 includes a neurostimulator 22 such as an Itrel II® Model 7424 or an Itrel 3® Model 7425 available from Medtronic, Inc. in Minneapolis, Minn., a stimulation lead extension 30, and a stimulation lead 40.
- the neurostimulator 22 is typically implanted subcutaneously in the patient's body 28 at a location selected by the clinician.
- the stimulation lead 40 is typically fixed in place near the location selected by the clinician using a device such as the adjustable anchor.
- FIG. 2 shows an implantable neurostimulation system 20 comprising an implantable neurostimulator 22, as stimulation lead 40, and a lead extension 30.
- the implantable neurostimulator 22 has a housing, a power supply carried in the housing 24, and stimulation electronics coupled to the battery and coupled to a connector block 26, which is also known as a terminal block.
- the stimulation lead 40 has a lead proximal end 45, a lead distal end 41 and a lead body 43.
- the lead proximal end 45 has at least one electrical connector 46 (also known as electrical terminals) and the lead distal end 41 has at least one stimulation electrode 42.
- An implantable neurological stimulation or monitoring system comprises an implantable neurological stimulator 22 or neurological monitor, an implantable neurological lead 40 , and at least one electrode 42.
- the implantable neurological stimulator 22 can be a Medtronic Itrel II® Model 7424 or an Itrel 3® Model 7425 or the like, both of which are commercially available.
- the neurological monitor 15 can be a Medtronic Neurodiagnostics Keypoint monitoring system.
- the implantable neurological lead 40 comprises a lead proximal end 45, a lead distal end 41, at least one conductor 50, at least one electrode 42, and at least one electrical connector 46.
- the lead proximal end 45 contains at least one electrical connector or contact 46 (e.g., a plurality of such contacts, such as 4, 8, 16 or more) that couples to the implantable neurological stimulator 22 or neurological monitor.
- the lead distal end 41 contains at least one electrode 42 but preferably a plurality of such electrodes (e.g., 4, 8, 16, etc.).
- the conductor 50 is contained in the lead 40 and extends from the lead proximal end 45 to the lead distal end 41.
- the conductor 50 may, for example, be stranded (made up of many small wires), braided-stranded or "BSW" (braided of many small wires), or solid (made up of one piece).
- the conductor 50 being electrically insulated by a polymer.
- the polymer could be, but is not limited to, ethylene tetrafluoroethylene (ETFE), polytetrafluoroethylene (PTFE), silicone rubber or polyurethane. Other materials that act as electrical insulators can be used.
- the electrical connector 46 is carried on the lead proximal end 45 and electrically connected to the conductor 50.
- the neurological lead 40 can be configured as a neurological stimulation lead, a neurological sensing lead, and a combination of both as a neurological stimulation and sensing lead.
- FIGS. 3 shows an implantable neurostimulation lead 40 embodiments that have a lead proximal end 45, a lead distal end 41 and a lead body 43.
- the lead proximal end 45 has at least one electrical contact 46 for connecting to a lead extension 30 or neurostimulator connector block i 26.
- the lead distal end 41 has at least one stimulation electrode 42.
- the lead body 43 carries at least one conductor 50 electrically connecting the lead proximal electrical contact 46 with the lead distal end 41 stimulation electrode 42.
- the lead body 43 can be composed of a wide variety of materials and configurations.
- Materials may include, but not be limited to silicone rubber, polyurethane, fiuoropolymers and the like. Configurations could include monolumen and multilumen tubings.
- the conductor 50 that electrical connects the lead proximal end 45 electrical contact 46 with the lead distal end 41 stimulation electrode 42 can be composed of a wide variety of material and configurations. Materials may include, but not be limited to MP35N, silver drawn filled tubing (Ag-DFT),
- the adjective "coiled” defines a structure spirally wound in a continuous series of loops.
- the noun “coil” refers to that segment of a coiled structure that encompasses 360 degrees of rotation about the axis of the coiled structure.
- the verb “coil” refers to the act of creating a coiled structure.
- the "pitch” is defined as the interval (distance) distance from center to center of the wire in adjacent coils. The pitch may be measured as an average pitch over a plurality (e.g., ten) coils, which may be a particularly convenient way to measure pitch for small pitches.
- the "direction of wind” refers to the fact that coils can be wound in either the left-hand (CW) or right-hand (CCW) direction.
- a “filar” is one wire.
- a “unifilar” coil is wound with a single continuous wire.
- a “mulif ⁇ ler” coil is wound with more than one filar.
- the conductors 50 includes at least one segment that is coiled at a first pitch (as illustrated in FIG. 5), although various exemplary embodiments involve multiple segments in which the conductor is coiled at different pitches, or in different directions (i.e. a left handed coiled structure versus right handed coiled structure).
- Exemplary embodiments allow a conversion from straight, miniature cables to a coiled configuration as part of the manufacturing process. This may be accomplished through the use a pair of extruded twist rings that allow the straight conductor to be twisted to a helical configuration after the outer j acket has been installed as illustrated in FIG. 3.
- twist rings 52 may be attached (bonded) to the center strut 56 of the lead body 43 and the conductors 50 are fed through its openings or grooves 58.
- the lead body outer jacket 60 and the second twist ring 54 are placed on the strut 56 after the conductors 50 are fed through the holes or grooves 58 in the twist ring 52 or 54.
- twist in the conductor 50 may be generated to any level desired (e.g., pitch or direction of wind).
- the second twist ring 54 is in then bonded to the strut 56. See figure 5.
- FIG. 8 A preferred exemplary method for manufacturing the lead body is illustrated in FIG. 8.
- This exemplary method involves (a) stringing the conductor wires 50 as straight wires along center strut 56 in step 100; (b) placing the first twist ring 52, outer jacket 60 and second twist ring 54 on the strut 56 with the straight wires 50 held in grooves 58 in struts in step 102; (c) rotating the first twist ring 52 relative to the second twist ring 54 to coil the originally straight wires in step 104; and (d) fixing the first and second twist rings 52 and 54 to the strut 56 in step 106.
- the order of these steps may be changed or overlap.
- FIG. 10 A second preferred exemplary illustration of the method is illustrated in FIG. 10.
- This exemplary method involves (a) fixing the first twist ring 52 to the strut 56 in step 300; (b) threading the conductor wire(s) 50 through the groove(s) 58 in the first twist ring 52 in step 302; (c) placing an outer jacket 60 over the strut 56 in step 304; (d) placing a second twist ring on the strut in step 306; (e) threading the conductor wire(s) through the groove(s) in the second twist ring in step 308; (f) rotating the second twist ring to coil the segment of the conductor wire(s) between the first and second twist rings in step 310; and (g) fixing the second twist ring to the strut in step 312.
- the order of these steps may be changed or overlap.
- the order to steps 300-308 may readily be varied among themselves so long as steps 310 and 312 are after steps 300, 302, 306 and 308.
- Figures 4 and 5 show two conductors 50 and four wire-holding grooves or openings 58, although it will be understood that the number of conductors 50 and wire-holding grooves or openings 58 may be more or less. Without limiting the possible number variations, certain exemplary embodiments may be suitable for four, eight or sixteen conductors.
- strut sections 62 and 64 (FIG. 5) of differing stiffness or durometers may be butt glued or bonded together to produce a final device with the desired stiffness at each location.
- a 75D, proximal end section (Strut 1, figure 5) may be bonded to a 55D or 80A section (Strut 2, figure 5) to produce the center section of the lead body and a 65D section may then be attached for an application where a slightly stiffer distal end is required.
- butt glued As used herein, "butt glued,” “butt bonded” or “butt joint” merely refer to an end-to- end bond or joint between two elongate structures, and is not limited to square-cut joints or such bonds or joints in which the plane of the joint is at a right angle to the longitudinal axis of the elongate structures.
- Preferred embodiments allow traditional lead body anchors to be used.
- At least one elongate conductor 50 and at least one (first) twist ring 52 holding a first portion of the elongate conductor 50 are assembled along an outer surface of inner elongate structure 56, such as a central strut.
- a second portion of the elongate conductor 50 is fixed to the outer surface of the inner elongate structure 50, with the second portion of the elongate conductor being spaced along the length of the elongate conductor from the first twist ring 52.
- the twist ring 52 is rotated relative to the longitudinal axis of the inner elongate structure 56 to coil the at least one elongate conductor 50.
- the order of assembling the first twist ring 52, conductor(s) 50 and strut 56 together, fixing the second portion of the conductor 50 to the strut, may be varied based on various processing objectives.
- the elongate conductor and at least one twist ring may be assembled along an outer surface of inner elongate structure before, during or after the step of fixing a second portion of the elongate conductor to the inner elongate structure.
- the second portion of the elongate conductor is fixed to the inner elongate structure 56 by a second twist ring 54, which may be bonded or otherwise fixed to the inner elongate structure 56.
- grooves, openings or holes 58 may be provided in the twist rings 52 and 54 (also twist rings 70, 72 and 74 discussed with respect to FIG. 7). At least one groove, opening or hole 58 is provided along the inner surface of the twist rings for receiving and holding the conductor 50 (or 76).
- the first portion of the elongate conductor may be placed (e.g., threaded) in the groove 58 of the first twist ring 52 (or 70); the second portion of the elongate conductor may be placed (e.g., threaded) in the groove of the second twist ring 54 (or 72); and, in the case of the multi-pitch embodiment illustrated in FIG. 7, the third portion of the elongate conductor may be placed (e.g., threaded) in the groove of the third twist ring 74.
- the inner elongate structure e.g., strut
- the inner elongate structure is formed with a lumen 59 adapted to guide a stylet in use of the implantable electrical lead 41.
- the stylet guiding lumen constitutes one exemplary embodiment of a means for guiding a stylet.
- an arrangement of twist rings e.g., twist rings 70, 72 and 74 in FIG. 7 may be employed to provide separate segments of the conductors 76 with different pitches or direction of wind from one another.
- the first and second twist rings 70 and 72 may define a first segment of conductor(s) 76 between the first and second twist rings, with the first segment being coiled with a first pitch and a first direction of wind following the rotation of one of the first and second twist rings 70 and 72 relative to the longitudinal axis of the inner elongate structure.
- the third twist ring 74 which holds a third portion of the elongate conductor, is spaced from the first and second twist rings along the length of the elongate conductor to define a second segment of the elongate conductor between the third twist ring and the whichever of the first and second twist rings is closer to the third twist ring (the second twist ring 72 in FIG. 7).
- the third twist ring may be rotated relative to the longitudinal axis of the inner elongate structure to coil the second segment of the elongate conductor at a second pitch or second direction of wind different than the first pitch or first direction of wind.
- the first and third twist rings 70 may be fixed (e.g., bonded, glued, mechanically fastened, etc.) to the elongate structure 71 subsequent to rotating the respective twist rings relative to the longitudinal axis of the inner elongate structure into their desired rotational positions.
- FIG. 9 A preferred exemplary method for manufacturing a lead body having more than one pitch of conductor wire(s) 76 is illustrated in FIG. 9.
- This exemplary method involves (a) stringing the conductor wires 76 (FIG. 7) as straight wires along center strut 71 in step 200; (b) placing the first twist ring 70, first outer jacket 78, second twist ring 72, second outer jacket 80 and third twist ring 74 on strut 71 with straight wires held in grooves in the twist rings 70, 72 and 74 in step 202; (c) rotating the first twist ring 70 relative to the second twist ring 72 to coil the originally straight wires in the first segment of the wires (segment defined between the first and second twist rings) at step 204; (d) rotating the third twist ring 74 relative to the second twist ring 72 at step 206 to coil the originally straight wires in the second segment of the wires (segment defined between the second and third twist rings) at a pitch or direction of wind different than the first segment
- a first outer jacket 78 may be assembled around the first segment of the conductor 76 and the inner elongate structure 71, preferably, as the twist rings 70 and 72 are placed on the strut 71; and a second outer jacket 80 may be assembled around the second segment of the conductor 76 and the inner elongate structure 71, preferably, as the twist rings 72 and 74 are placed on the strut 71.
- the first, second and third twist rings 70, 72 and 74 and the first and second outer jackets 78 and 80 may have a substantially similar outer diameter such that the assembly of the outer jacket and twist rings has a substantially uniform outer diameter.
- the first and third twist rings 70 may be fixed (e.g., bonded, glued, mechanically fastened, etc.) to the elongate structure 71 subsequent to rotating the respective twist rings relative to the longitudinal axis of the inner elongate structure into their desired rotational positions.
- twist rings and coiled segments may be employed beyond that shown in figures 4, 5 and 7, and the pitch or direction of wind could be varied to obtain various properties along the lead body, such as stress relief, allowance for stretch of the lead body, varying stiffness or durometer, sections adapted for engagement with an anchor, sections in which the conductors are left in a straight configuration combined with sections in which the coil is right handed, etc.
- the conductors include (a) segments in the distal end portion 41 that are either uncoiled (straight) or nearly so (helping to keep resistance low in the segments of the conductors located in the distal end portion 41); (b) segments in a cenhal section of the lead body 43 with a moderate pitch to fill the space between the outer jacket 60, 78 or 80 to provide strain relief to compensate for bending of the lead, reduction of stylet pinch (in embodiments in which a stylet guiding lumen is provided in the center strut), and resistance to collapse to facilitate anchoring the central section; and (c) segments in the proximal end portion 45 that may have a pitch ranging from uncoiled to tightly coiled depending upon specific application.
- Preferred embodiments allow traditional lead body anchors to be used.
- Exemplary embodiments may be used for any implantable tissue stimulation, such as spinal cord stimulation, brain stimulation, sacral nerve stimulation, vagal nerve stimulation, peripheral nerve stimulation, cardiac stimulation, etc.
- implantable tissue stimulation such as spinal cord stimulation, brain stimulation, sacral nerve stimulation, vagal nerve stimulation, peripheral nerve stimulation, cardiac stimulation, etc.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US50801803P | 2003-10-02 | 2003-10-02 | |
PCT/US2004/032731 WO2005032651A1 (en) | 2003-10-02 | 2004-10-01 | Implantable medical lead and method of manufacture |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1680180A1 true EP1680180A1 (en) | 2006-07-19 |
EP1680180B1 EP1680180B1 (en) | 2007-02-28 |
Family
ID=34421695
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04794173A Not-in-force EP1680180B1 (en) | 2003-10-02 | 2004-10-01 | Implantable medical lead and method of manufacture |
Country Status (5)
Country | Link |
---|---|
US (1) | US7184838B2 (en) |
EP (1) | EP1680180B1 (en) |
AT (1) | ATE355097T1 (en) |
DE (1) | DE602004005066T2 (en) |
WO (1) | WO2005032651A1 (en) |
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- 2004-10-01 AT AT04794173T patent/ATE355097T1/en not_active IP Right Cessation
- 2004-10-01 US US10/957,456 patent/US7184838B2/en not_active Expired - Fee Related
- 2004-10-01 EP EP04794173A patent/EP1680180B1/en not_active Not-in-force
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US20050113899A1 (en) | 2005-05-26 |
EP1680180B1 (en) | 2007-02-28 |
ATE355097T1 (en) | 2006-03-15 |
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